期刊
MATERIALS CHARACTERIZATION
卷 80, 期 -, 页码 62-68出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2013.03.011
关键词
Lithium-ion battery; Microstructure reconstruction; Simulated annealing approach; Microstructure characterization; Tortuosity
类别
资金
- CAS
- Amperex Technolgy Limited-Dongguan
We adapt the simulated annealing approach for reconstruction of the 3D microstructure of a LiCoO2 cathode from a commercial Li-ion battery. The real size distribution curve of LiCoO2 particles is applied to regulate the reconstruction process. By discretizing a 40 x 40 x 40 mu m cathode volume with 8,000,000 numerical cubes, the cathode involving three individual phases: 1) LiCoO2 as active material, 2) pores or electrolyte, and 3) additives (polyvinylidene fluoride + carbon black) is reconstructed. The microstructural statistical properties required in the reconstruction process are extracted from 2D focused ion beam/scanning electron microscopy images or obtained by analyzing the powder mixture used to make the cathode. Characterization of the reconstructed cathode gives important structural and transport properties including the two-point correlation functions, volume-specific surface area between phases, tortuosity and geometrical connectivity of individual phase. (C) 2013 Elsevier Inc. All rights reserved.
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